#include <bits/stdc++.h>
using namespace std;

int a[1000005];

int main()
{
	freopen("color.in","r",stdin);
	freopen("color.out","w",stdout);
	int t, n;
	cin >> t;
	for(int i = 1; i <= t; i++)
	{
		cin >> n;
		for(int j = 1; j <= n; j++)
		{
			cin >> a[j];
		}
		cout << "0" << endl;
	}
	fclose(stdin);
	fclose(stdout);
	return 0;
}
